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|
package bench
import (
"crypto/rand"
"encoding/hex"
"errors"
"io/ioutil"
"math"
mathrand "math/rand"
"os"
"path/filepath"
"strconv"
"sync"
)
func createTestDir(n int) (string, error) {
const nesting = 1.0 / 3.0
rootDir, err := ioutil.TempDir(os.Getenv("BENCH_BASE_DIR"), "diffcopy")
if err != nil {
return "", err
}
dirs := int(math.Ceil(math.Pow(float64(n), nesting)))
if err := fillTestDir(rootDir, dirs, n); err != nil {
os.RemoveAll(rootDir)
return "", err
}
return rootDir, nil
}
func fillTestDir(root string, items, n int) error {
if n <= items {
for i := 0; i < items; i++ {
fp := filepath.Join(root, randomID())
if err := writeFile(fp); err != nil {
return err
}
}
} else {
sub := n / items
for n > 0 {
fp := filepath.Join(root, randomID())
if err := os.MkdirAll(fp, 0700); err != nil {
return err
}
if n < sub {
sub = n
}
if err := fillTestDir(fp, items, sub); err != nil {
return err
}
n -= sub
}
}
return nil
}
func randomID() string {
b := make([]byte, 10)
rand.Read(b)
return hex.EncodeToString(b)
}
var buf []byte
var once sync.Once
func randBuf() []byte {
once.Do(func() {
var size int64 = 64 * 1024
if s, err := strconv.ParseInt(os.Getenv("BENCH_FILE_SIZE"), 10, 64); err == nil {
size = s
}
buf = make([]byte, size)
rand.Read(buf)
})
return buf
}
func writeFile(p string) error {
tf, err := os.Create(p)
if err != nil {
return err
}
if _, err := tf.Write(randBuf()); err != nil {
return err
}
return tf.Close()
}
func mutate(root string, n int) error {
del := n
add := n
mod := n
stop := errors.New("")
for {
if err := filepath.Walk(root, func(path string, info os.FileInfo, err error) error {
if !info.IsDir() {
if mathrand.Intn(3) == 0 {
switch mathrand.Intn(3) {
case 0:
if del > 0 {
del--
os.RemoveAll(path)
}
case 1:
if add > 0 {
add--
fp := filepath.Join(filepath.Dir(path), randomID())
if err := writeFile(fp); err != nil {
return err
}
}
case 2:
if mod > 0 {
mod--
if err := writeFile(path); err != nil {
return err
}
}
}
}
}
if add+mod+del == 0 {
return stop
}
return nil
}); err != nil {
if err == stop {
return nil
}
return err
}
}
}
|
